MH. W. JOSHUA ON BURMESE DESMTDIEiB. 651 



furnished with 8 or 9 truncate spines set outward. It appears 

 sufficiently distinct from D. verrucosum, Bailey, as shown in the 

 figure, and those of Eev. F. "Wolle, Desm. TJ. States. "With slight 

 inflation at point of juncture. Length 200-330 /j. ; breadth 25- 

 35 /x ; width of apex 16-24 li. 



D. annulatum, n. sp. (Plate XXV. fig. 13.) 

 _D. mediocre, diametro 10-11-plo longius, basi paulo majore: 

 semicellula crenulationibus 12-14 ornata seriem regularem pro- 

 jectionum annularum sisteutibus : membrano incolore, distincte 

 punctato : apice truncato, leviter angustato, saepe dentibus bre- 

 vibus obtusis instructo. Longit. 235 li, latit. suturae 25 li, latit. 

 apicis 16 li. 



Medium size ; 10-11 times longer than wide, with slight en- 

 largement at base ; semicell with 12-14 crenulations, forming a 

 regular series of annular projections ; membrane colourless and 

 distinctly punctate ; end truncate, slightly narrowed, frequently 

 furnished with short blunt teeth. Length 235 li ; width at 

 suture 25 li • width at apex 16 li. 



D. bubmense, n. sp. (Plate XXV. fig. 14.) 



-D. magnum, diametro 15-20-plo longius : semicellula profunde 

 constricta, constrictionibus 11-12: nulla extra basin inflatione : 

 puncto junctionis haud valide notato : apicibus truncatis, leviter 

 angustatis, dentibus 8-10 brevibus obtusis instructis : membrano 

 tenui, indistincte punctato. Longit. 660-850 li, latit. ad basin 

 35 li ; apicis latit. 20-27 li. 



Large; 15-20 times longer than broad, having in semicell 

 11 or 12 deep constrictions ; no extra basal inflation ; point of 

 junction not strongly marked ; apices truncate, slightly narrowed, 

 and furnished with 8-10 short blunt teeth ; membrane thin, in- 

 distinctly punctate. Its nearest resemblance is to D. constrictum, 

 Bailey, from which it differs in its greater length, undulate habit, 

 and attenuated apices. Length 660-850 li ; width at base 35 /u ; 

 width at apex 20-27 /x. 



D. cobonulatum, Grun. 



Abundant. Often joined in long filaments. Showing points 

 of junction and covering of apex (PI. XXV. figs. 16 & 17). 

 D. minutum, Nae(j. 



14. Tbiplocebas, Bailey . 

 T. UBACiLE, Bailey. 



3o2 



